Finding the Fourth Proportional to 105.00, 144.86 and 72.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105.00 : 144.86 = 72.28 : x
2. Step 2: Convert to fraction form
   105.00/144.86 = 72.28/x
3. Step 3: Cross multiply
   105.00x = 144.86 × 72.28
4. Step 4: Simplify right side
   105.00x = 10,469.49
5. Step 5: Solve for x
   x = 10,469.49/105.00
6. Step 6: Final answer
   x = 99.71